Stamp-mill.



UNITED STATES PATENT oEEroE JOSEPH F. SYMONS AND WILLIAM H. PAULL, OF LAKE LINDEN, MICHIGAN.

STAMP-MILL.

Specification of Letters Patent,

Patented July 9, 1907.

Application filed May 4,1907. Serial No. 371,867.

To all whom "it may concern:

Be it known that we, Josnrn F. SYMONS and WIL- LIAM H. PAULL, citizens of the United States, residing at Lake Linden, in the county of Houghton and State of Michigan, have invented a new and useful Stamp-Mill, of which the following is a specification.

This invention relates to steam stamp mills, and has for its principal object to provide an impgoved construction of cylinder and valve connections, whereby a portion of the steam which is utilized to raise the stamp head may, also, be employed for assisting downward or operative movement of the stamp.

A further object of the invention is to so construct and arrange the connections as to permit the operation of the mill in the ordinary manner or to utilize the steam to assist the downward movement in accordance with the strength of the blow desired.

With these and other objects in view, as will more fully hereinafter appear, the invention consists in certain novel features of construction and arrangement of parts, hereinafter fully described, illustrated in accompanying drawings, and particularly pointed out in the appended claims, it being understood that various changes in the form, proportions, size and minor details of the structure may be made without departing from the spirit or sacrificing any of the advantages of the invention.

In the accompanying drawingsz Figure 1 is a sectional elevation of the actuating cylinder of a stamp mill provided with valved connections arranged in accordance with the invention. Fig. 2 is a similar view showing the valve adjusted to another position.

Similar numerals of reference are employed to indicate corresponding parts throughout the several figures of the drawings.

The stamp mill is preferably of that general type shown and described in Letters-Patent of the United States, No. 818,985, granted to us on April 24, 1906, and in which a pair of rubber blocks are employed between the frame and the stamp shaft or head for the purpose of giving the stamp shaft an initial return movement.

The cylinder 10 is bored out to receive a piston 11, which is connected to the stamp shaft 12 in the usual manner, and at one side of the cylinder is a steam chest 15, to which is connected a, steam supply pipe 16. Leading from the cylinder to the steam chest is a port 19 under the control of a slide valve 20, that is operated in the manner usually practiced in devices of this class, and when the valve is in one position, steam is allow ed to enter the cylinder through the port 19 for the purpose of raising the piston 11 and the stamp head. When moved to the opposite position the steam below the piston is allowed to exhaust through the port 21 to a pipe 22.

At one side of the cylinder is a transfer or by pass 26, which is connected to the bore of the cylinder by two ports 27 and 28 that are spaced from each other at a distance greater than the width of the piston, so that if the ports are open and the piston is moving upward a portion of the steam may pass from below the piston through the ports to a position above said piston, and there form a cushion between the top of the piston and the upper cylinder head, the body oi steam being compressed and serving by expansion to assist the resilient cushions in imparting an initial down stroke to the stamp.

In the by pass is a check valve 29 which holds the steam or other fluid in the upper portion of the cyl inder. This by pass also includes a valve 30 which may be closed when the by pass is not in use, as Will hereinafter appear.

Leading from the top of the cylinder is an exhaust pipe 38 which is connected to a valve casing 39, and to the lower end of this valve casing is connected a discharge pipe 22. Leading from the casing is a final exhaust pipe 40.

The casing 39 contains a three way valve 42 which may be turned for controlling communication between the three pipes 22, 38 and 40, and when valve 30 is opened the pipes 22 and 40 will be placed in communication with each other in order not to interfere with the free exhaust of steam from below the piston as the latter descends, while communication with pipe 38 is shut off in order to hold the cushion in the upper portion of the cylinder.

Leading through the side wall of the cylinder is a preliminary escape port 45 through which a portion of the cushioning steam escapes when the piston has moved down to a sufficient extent to uncover the port.

When it is not desired to employ the cushion in the upper portion of the cylinder, the valve 30 is moved to closed position and the three way cock 42 is moved to the position shown in Fig. 2, so that the upper portion of the cylinder will. be placed in communication with the exhaust. When the parts are in this position, a portion of the exhaust is allowed to enter the cylinder above the piston during the down stroke of the latter, in order that the vacuum which would otherwise be formed in the upper portion of the cylinder will not retard the down blow.

We claim:---

In apparatus of the class described, a cylinder having upper and lower heads, means for controlling the admisof the cylinder, :1 by pass having a controlling valve, and I In testimony that we claim the foregoing as our own, 10 a check valve, said by pass being arranged to admit a porwe have hereto affixed our signatures in the presence of tion of the fluid from the lower to the upper portion of the two witnesses.

cylinder, an exhaust pipe leading from the exhaust port,

a valve casing in said exhaust pipe, a pipe placing the valve casing in communication with the upper part of the cylinder, and a three Way cock in the valve casing for con- Witnesses trolling communication with the upper part of the cylinder J. M. P. PICHETTE, and the exhaust. CHARLES WERNER.

JOSEPH F. SYMONS/ WILLIAM H. PAULL. 

